ABCC7 p.Arg117Lys
| ClinVar: |
c.350G>C
,
p.Arg117Pro
?
, not provided
c.349C>G , p.Arg117Gly ? , not provided c.350G>T , p.Arg117Leu ? , not provided c.349C>T , p.Arg117Cys D , Pathogenic c.350G>A , p.Arg117His D , Pathogenic |
| CF databases: |
c.350G>A
,
p.Arg117His
?
, Varying clinical consequence ; CFTR1:
c.349C>T , p.Arg117Cys D , CF-causing ; CFTR1: The haplotype is 2-1-1-2 (XV2c-KM19-D9-J44) with seven GATT repeats. The mutation creates a new Bsml site. c.349C>G , p.Arg117Gly (CFTR1) ? , Was reported previously in one study of CBAVD. R117G/UND 7T/9T (Daudin et al., Fertility and Sterility, 74:1164-1174, 2000). c.350G>C , p.Arg117Pro (CFTR1) ? , A new missense mutation was found in exon 4 : R 117 P. The mutation was detected by DGGE analysis and identified by remplacement of an arginine residue by a proline at codon 117. The mutation creates new MnlI and NlaIV sites. The mutation was identified in one french CF chromosome. The patient has a mild lung disease and is sufficient pancreatic. c.350G>T , p.Arg117Leu (CFTR1) ? , This mutation was identified by DGGE and direct sequencing and was identified on one CF chromosome of Italian origin. |
| Predicted by SNAP2: | A: D (91%), C: D (63%), D: D (95%), E: D (95%), F: D (91%), G: D (95%), H: N (53%), I: D (85%), K: D (95%), L: D (63%), M: D (85%), N: D (95%), P: D (66%), Q: D (95%), S: D (95%), T: D (95%), V: D (91%), W: D (95%), Y: D (95%), |
| Predicted by PROVEAN: | A: N, C: D, D: N, E: N, F: N, G: N, H: N, I: N, K: N, L: N, M: N, N: N, P: N, Q: N, S: N, T: N, V: N, W: N, Y: N, |
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[hide] Three charged amino acids in extracellular loop 1 ... J Gen Physiol. 2014 Aug;144(2):159-79. doi: 10.1085/jgp.201311122. Epub 2014 Jul 14. Cui G, Rahman KS, Infield DT, Kuang C, Prince CZ, McCarty NA
Three charged amino acids in extracellular loop 1 are involved in maintaining the outer pore architecture of CFTR.
J Gen Physiol. 2014 Aug;144(2):159-79. doi: 10.1085/jgp.201311122. Epub 2014 Jul 14., [PMID:25024266]
Abstract [show]
The cystic fibrosis (CF) transmembrane conductance regulator (CFTR) bears six extracellular loops (ECL1-6); ECL1 is the site of several mutations associated with CF. Mutation R117H has been reported to reduce current amplitude, whereas D110H, E116K, and R117C/L/P may impair channel stability. We hypothesized that these amino acids might not be directly involved in ion conduction and permeation but may contribute to stabilizing the outer vestibule architecture in CFTR. We used cRNA injected oocytes combined with electrophysiological techniques to test this hypothesis. Mutants bearing cysteine at these sites were not functionally modified by extracellular MTS reagents and were blocked by GlyH-101 similarly to WT-CFTR. These results suggest that these three residues do not contribute directly to permeation in CFTR. In contrast, mutants D110R-, E116R-, and R117A-CFTR exhibited instability of the open state and significantly shortened burst duration compared with WT-CFTR and failed to be locked into the open state by AMP-PNP (adenosine 5'-(beta,gamma-imido) triphosphate); charge-retaining mutants showed mainly the full open state with comparably longer open burst duration. These interactions suggest that these ECL1 residues might be involved in maintaining the outer pore architecture of CFTR. A CFTR homology model suggested that E116 interacts with R104 in both the closed and open states, D110 interacts with K892 in the fully closed state, and R117 interacts with E1126 in the open state. These interactions were confirmed experimentally. The results suggest that D110, E116, and R117 may contribute to stabilizing the architecture of the outer pore of CFTR by interactions with other charged residues.
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No. Sentence Comment
182 We generated D110E-, E116D-, and R117K-CFTR and observed their single-channel behavior with the inside-out patch technique in symmetrical 150 mM Cl&#e032; solution at VM = &#e032;100 mV.
X
ABCC7 p.Arg117Lys 25024266:182:33
status: NEW213 was less marked when R117K- and R117A-CFTR were compared (P < 0.05; Fig. 7, C and E).
X
ABCC7 p.Arg117Lys 25024266:213:21
status: NEW218 D110, E116, and R117 do not interact with each other locally Because charge-retaining ECL1 amino acid mutations D110E, E116D, and R117K partially rescued a steady Figure 6.ߓ Some ECL1 mutants exhibit altered rectification.
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ABCC7 p.Arg117Lys 25024266:218:130
status: NEW246 (A-C) Representative single-channel currents of D110R- and D110E- (A), E116R- and E116D- (B), and R117A- and R117K-CFTR (C) recorded under the same conditions as Fig. 2 A.
X
ABCC7 p.Arg117Lys 25024266:246:109
status: NEW248 (D) Mean single-channel amplitude of WT-, D110R-, D110E-, E116R-, E116D-, R117A-, and R117K-CFTR.
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ABCC7 p.Arg117Lys 25024266:248:86
status: NEW250 (E) Mean burst duration of WT-, D110R-, D110E-, E116R-, E116D-, R117A-, and R117K-CFTR.
X
ABCC7 p.Arg117Lys 25024266:250:76
status: NEW251 #, P < 0.001 indicates differences between D110R- and D110E-CFTR or E116R- and E116D-CFTR; *, P < 0.05 indicates differences between R117A- and R117K-CFTR.
X
ABCC7 p.Arg117Lys 25024266:251:144
status: NEW423 As shown here, mean burst durations of charge-retaining mutants D110E-, E116D-, and R117K-CFTR are significantly longer than their related charge-reversing or charge-destroying mutants D110R-, E116R-, and R117A-CFTR but distinctly shorter than that of WT-CFTR (Fig. 7).
X
ABCC7 p.Arg117Lys 25024266:423:84
status: NEW